Very much so...
The thing to keep in mind when building links is what you are actually trying to do. The real goal is to build links to your site that as much as possible mimic real natural links so that Google can not tell the difference between your link profile and the profile of a site that has not done any artificial link building. This is the main reason you want to keep a diversified link profile as possible because real sites get all kinds of links so this makes it much harder for Google to find a pattern that shows your links are fake.
All tiers are is taking sites/pages and building them up so they have some strength to give your money site. You basically have two choices, you can purchase links/domains that already have the strength you are looking for or you can build that strength yourself. Building tiers is just building your own strength rather than buying it.
Do you build them the same way you did a few years ago or pretty much the same?